Other states don't care so much about fuel economy. The folks at iSeeCars, a site created to help consumers find used and new cars for sale, crunched the data from 30 million used car sales around the U.S. to find where MPG numbers matter to buyers, and where they don't.

Here are the largest 10 American cities, ranked by the percent of cars sold that get 22.5 miles per gallon or less:

And here are large cities ranked by ranked by the percent of cars sold that get 30 miles per gallon or more: